What it does: Heavy-duty high-speed steel bridge reamers expand or align existing holes through mild steel, alloys, aluminum, wood, plastic, fiberglass, or any material of similar hardness prior to rivet or bolt installation. Deburring and trimming of holes in structural materials. Application: Suitable for steel, metal, alloy aluminum, brass, plastic, iron, nickel, copper, cast iron, and other structural materials. Design: Tapered point design allows reamer bits to enter irregular overlapping holes and align bolt holes. Note: The 1-inch bridge reamer bit is not a drill bit; it only aligns the reamer with the pre-drilled hole. To enlarge a hole to 1 inch, a pre-drilled hole must first be made, then reamed to 1 inch. Material: Made of high-quality high-speed steel, offering high toughness, heat resistance, durability, and long service life. Applies to: Reamer bit fits steel, metal, wood, and alloy materials for aligning existing holes and enlarging holes. Function: Aligns existing holes and enlarges undersized holes before bolt or rivet installation. Commonly used in bridge, construction, steel, and automotive truck trailer industries, especially on structural materials such as steel, metal, alloy aluminum, brass, plastic, iron, nickel, copper, and cast iron. Three symmetrically placed flats on shank provide positive grip in portable electric and pneumatic tools. Notice: 1. Apply cutting oil before using the reamer. 2. The reamer is used to enlarge holes to 1 inch. A pre-drilled hole is required before reaming to 1 inch. Cutting Direction: Right-hand Shank Diameter: 1 inch Color: Black Material: High-speed steel Package Contents: 1 x Tapered reamer Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm.